Merge pull request #22 from pedro-stanaka/feat-upgrade-assets

Upgrading assets and added support for new Params
Merge pull request #23 from pedro-stanaka/feat-easy_drilldown

New way to drill down
Added VERSION.txt
Renamed files to maintain consistent Highchart product name throughout
Delete HighChartsComponent.php
Delete HighChartsAppController.php
Delete HighChartsDemoController.php
Delete HighChartsAppModel.php
Delete HighChartsHelper.php
Deleted duplicate
Minor updates to Highchart product name, copyright year and readme
updated README
updated layout file
Added composer.json
added minimum stability version to composer
Update composer.json
Update composer.json
updated composer.json